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This isn't a big problem usually, but some dogs can still get an upset stomach if a large amount was eaten or if your particular dog is somewhat dairy intolerant. Likely you'll only see diarrhea or soft stools, if anything. If this does occur, I would follow the following protocol to help settle the upset GI tract:
Fast for 12 hours, but do allow water if she'll drink. (If not, she can always have some unflavored pedialyte). Then when you do feed, give a bland diet like boiled chicken or boiled hamburger meat with white rice (1:1 ratio). No treats, and don't let her eat grass either. Continue this diet for a couple of days as the stool firms up. Once firmed up, gradually go back to the regular diet over the course of a few meals.
If needed for diarrhea if it is bad (unlikely), you could also give Immodium (loperamide), which dosing information found here:
I wouldn't worry for now if she's acting fine, if diarrhea occurs try this, and if not clearing up in a couple of days, you'll want to make a vet appointment then. I'm sure she'll be just fine.
Best of luck, and let me know if I can help further.